Superpredator theory
During the 1990s in the United States, a theory became popular that said there are some impulsive juvenile criminals—superpredators—who are willing to commit violent crimes without remorse. John J. DiIulio Jr., the criminologist and political scientist who came up with the idea, predicted a large increase in youth crime and violence due to superpredators. American lawmakers seized on this idea, and implemented tough-on-crime legislation for juvenile offenders across the country.
The theory was criticized when crime significantly decreased in the following years. Dilulio has since retracted some of his ideas. There are many alternative explanations to the rise in crime until the 1990s and the subsequent drop. One explanation is the lead–crime hypothesis, which says that the use of leaded gasoline could have caused the high crime rates in the 1980s and 90s. Kevin Drum, an American journalist, argued that the "superpredators" that Dilulio described as impulsive, violent, and conscienceless may have actually had lead poisoning.
